Food is moved through the digestive system by ____.
A. sphincters
B. accessory organs
C. smooth muscle contractions
D. movement of villi
E. skeletal muscle contractions
Answer: C
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Which is true of heterotrophs?
A) They capture light energy. B) They cannot be unicellular. C) They store energy in the form of heat. D) They can function as autotrophs in an emergency. E) They can obtain energy from consuming phototrophs.
The nucleus of an atom is composed of
A. protons. B. neutrons. C. electrons. D. protons and neutrons. E. protons and electrons.
In all animals, the largest percentage of the body's fluids are located in the:
A. intracellular compartment. B. extracellular compartment. C. interstitial fluid. D. plasma. E. hemolymph.
The white protective fibrous tissue of the eye, often called the white of the eye, is the
a. lens. b. sclera. c. pupil. d. iris. e. retina.